meatus (redirected from ethmoidal meatus)

meatus /me·a·tus/ (me-a´tus) pl. mea´tus   [L.] an opening or passage.mea´tal

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acoustic meatus , auditory meatus either of two passages in the ear, one leading to the tympanic membrane (external acoustic m.), and one for passage of nerves and blood vessels (internal acoustic m.) .

nasal meatus  one of the four portions (common, inferior, middle, and superior) of the nasal cavity on either side of the septum.

urinary meatus  the opening of the urethra on the body surface through which urine is discharged.

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me·a·tus (m-ts)

n. pl. me·a·tus·es or meatus

A body opening or passage, especially the external opening of a canal.

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meatus

[mē·ā′təs] pl. meatuses

Etymology: L, channel

an opening or tunnel through any part of the body, such as the external acoustic meatus that leads from the external ear to the tympanic membrane.

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meatus (mēˑ·ts),

n a natural channel or opening within the body.

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meatus

pl. meatus [L.] an opening or passage.

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acoustic meatus, meatus acusticus, meatus auditorius, auditory meatus

a passage in the ear; see external acoustic meatus and internal acoustic meatus (below).

ethmoidal meatus

the spaces between the ethmoturbinal bones.

external acoustic meatus

the passageway within the ear between the ear flap and the eardrum.

internal acoustic meatus

the passageway on the medial surface of the petrous temporal bone; transmits the facial and vestibulocochlear nerves.

meatus nasi, meatus of nose

one of the three main airways of the nasal cavity which are found on either side of the septum; they are the dorsal, middle and ventral meati.

nasopharyngeal meatus

the common space shared by the right and left nasal cavities just before they enter the nasopharynx.

meatus urinarius, urinary meatus

the opening of the urethra on the body surface through which urine is discharged.